Odd question I know... but can anyone tell me whether an Arrow II can be cruised at the bottom end of the 'unsympathetic vibration' range on the tacho, ie 2100rpm I think, and say 21 inches manifold pressure. Will it sustain level flight in this config? and if so what is the likely IAS?

What is the 55% endurance crusie data?

Cheers

PS, no I don't have access to a POH.

2100 RPM is indeed approved for flight at 65% power or less - Refer to the Power setting table in the Pilot Information Manual.

55% Power at 2100 RPM is obtained at the following Manifold Pressure settings;

SL 22.9
1K 22.7
2K 22.4
3K 22.2
4K 21.9
5K 21.7
6K 21.4
7K 21.2
8K 21.0
9K Full Throttle

The book fuel flow figure for 55% is 8 US Gal Per Hour

The aircraft definitely flies at this approved power setting.

Note that the above heights are Pressure Altitude and ISA


Regards,

DFC

Thanks very much DFC. Any chance of some airpseeds?! Say, 55% at 2000 ft ISA. Ta very much. Just thinking about things...
;)